CPM and CPC ROI Calculators

CPC Tool -- calculates return on investment (ROI) in percent based on monthly click, average CPC, conversation rate and average profit per conversion.
CPC Tool -- calculates return on investment (ROI) in percent based on monthly impressoins from CPM advertising, cost of CPM, Conversion rate, average profit per conversion.

Source: http://searchmarketing.yahoo.com/rc/srch/

seo tool land seo leaders online traffic mystic good backlink see book